Which Audi electric sedan shares the J1 platform with the Porsche Taycan?

The Audi e-tron GT is the electric sedan that shares the J1 platform with the Porsche Taycan.

Audi developed the e-tron GT as a low, four-door battery-electric grand tourer, while Porsche used the same Volkswagen Group J1 architecture for the Taycan. The relationship is architectural rather than cosmetic: the cars share major platform concepts, including an 800-volt electrical system, high-performance battery packaging and a two-speed rear transmission in many configurations.

The e-tron GT entered production in late 2020 and went on sale in 2021. It was assembled at Audi’s Böllinger Höfe facility in Heilbronn, Germany, alongside the R8. The range includes the higher-performance RS e-tron GT, which uses the same basic electric-car foundation with stronger performance tuning.

The A6 e-tron is a newer model based on Audi’s PPE platform, not J1. The Q4 e-tron uses the Volkswagen Group MEB architecture, while the Q8 e-tron belongs to a different SUV line, so none of those alternatives fits the question.